Heated cement supply system for shoe machine



Oct. l5, 1968 E. HAAS 3,406,276

HEATED CEMENT SUPPLY SYSTEM FOR SHOE MACHINE Filed Feb. 25, 1956 22` f., FIG' F|G.2

f f la v4 f 3o z 32 I6 3A 1A f 42 36 64 sa 'f 39 a 20 40/ :j IOS i n 0 I 4e I /l60 28 e ze i '9 n lez E I lo; l5 cz. o L! 9 I V/so ATTORNEYS United States Patent Of 3,406,276 i HEATED ICEMENT SUPPLY SYSTE vFOR SHOE MACHINE Edgar Haas, New York, N.Y., assignor to Universal Shoe Machinery Corp., Brooklyn, N.Y., a corporation of New York Filed Feb. 23, 1966, Ser. No. 529,504V

9 Claims. (Cl. 219-421) This invention relates to shoe machines, especially toe lasting machines with a cement applicator, and more particularly to a heated cement supply system for the same.

A prior Patent No. 3,228,047 issued Ian. 11, 1966, to the same assignee, and entitled, Toe Lasting Machine With Cement Applicator, discloses a toe lasting machine which makes it possible to use a very fast acting cement. For this purpose the cement is kept in a heated chamber; it is applied to the insole by direct contact through cups in a heated annular support while that support is in tight contact with the insole; the cement is conveyed from the chamber to the support through a hose which is itself heated; a pump ejects a measured quantity of the cement and is itself submerged in the heated cement; special mechanism is provided to insure dependable opening of the check valve of the submerged pump; and the same mechanism may be used to adjust the quantity of cement transferred..

The general object of the present invention is to irnprove the cement supply system and particularly the heated hose used to convey the cement from the pump to the applicator or annular support referred to above.

To accomplish the foregoing general object, and other more specific objects which will hereinafter appear, my invention resides in the heated cement supply system and the elements thereof as are more particularly described in the following specication. The specification is accompanied by drawings in which:

FIG. 1 is a schematic vertical section through a lasting machine embodying features of the present invention;

FIG. 2 is a partially sectioned elevation through the cement supply system;

FIG. 3 is an electrical diagram showing the heating circuitry for the system;

FIG. 4 is a section through the heated hose taken on the line 4-4 of FIG. 2; and

FIG. 5 is a section through the terminal block, taken on the line 5-5 in FIG. 2. y 5

Referring to the drawing, the lasting machine here shown is one made by Schoen & Cie, G.m.b.H. of Pirmasens, Germany, it being their model 63C Pulling Over and Toe Lasting Machine. The said machine is disclosed and described in United States Patent No. 3,066,329 of Albert Michel and Herbert Schindler, issued Dec. 4, 1962, and entitled Machine for Pulling Over a Last and Gluing the Uppers of Shoes. The machine has been improved as shown in the aforesaid United States Patent No. 3,228,047, and FIG. 1 here corresponds substantially to FIG. 1 in that patent.

f Referring to FIG. 1 a last 12 is preliminarily provided with an insole on its bottom and an upper around the last. The assembly is placed on a double bottom rest 14 and 34, and a treadle 15 is operated through several steps and/ or several times, depending on the particular control mechanism used in box v17. Without specifying a particular sequence at this time, an actuator or hydraulic cylinder 16 moves a machine head generally designated 18 toward the left about a pivot 19 to bring the lasting mechanism to the shoe 12 on the support 14, 34; a cylinder at 20 causes a lever 22 to move a toe presser 24 against the top of the toe portion of the shoe; and a 3,406,276 Patented Oct. 15, y1968 cylinder 26 causes a lever 28 pivoted at 29 to move a heel abutment 30 against the heel of the Shoe. Five pincers, not shown (a toe pincer, two side pincers, and two ball pincers), pull the lower edge of the upper downwardly, rthis resulting from the` operation of small hydraulic cylinders (not shown) controlling the individual pincers.

The double bottom rest consists of a main or bottom support 14, surrounded by an annular support 34 which receives the marginal portionr of the shoe. This is here used`primarily as a heated cement applicator. In FIG. 1 the main bottom support 14 is mounted on a slide bar 36, and is controlled by toggle linkage 38, 39 which may be pushed sideward by a small actuator cylinder 40 in order to lower the support 14. The applicator support 34 is carried by a post 42 moved by a rod 44 and another actuator cylinder 46. The applicator support 34therefore may be lowered independently and ahead of the main bottom support 14.

Another cylinder 32 then causes movement of the wipers. They are flat wiper blades which rst move longitudinally of the shoe around its toe portion, and then inward, this motion being caused by the piston of actuator 32, which has a yoke or cross-bar the ends of which are connected by adjustable links to two wiper blade holders. There is a bodily movement toward the left as Viewed in FIG. l, and a pivotal movement horizontally toward one another. The applicator support 34 is lowered by actuator 46 and the pincers are released, before the wipers move in beneath the marginal portion of the shoe enough to support the shoe. At this time the bottom support 14 is still elevated, but it then descends when actuator 40 releases the toggle 38, 39, thereby clearing a path for additional inward movement of the wipers.

The applicator support 34 is described in greater detail in said'Patent 3,228,047, and is here represented only schematically by the part 34 in FIG. 3. It has an annular cement ow passage which terminates in upwardly directed discharge holes or cups, and these are supplied through a flexible supply hose the end of which is indicated at 64 in FIG. l. The applicator Support 34 is itself provided with electrical heating means which may be a conventional strip heater indicated schematically at 72 in FIG. 3. The heater is bent to U-shape and follows the contour of the support. The hose end 64 is also indicated at two points in FIG. 3, which in practice are connected together. i

Referring now to FIG. 2, t-he present machine, as in Patent 3,228,047, includes a chamber for a fast-acting thermoplastic cement. This chamber is heated by an electrical heating means or jacket indicated in broken lines at 82. A plunger pump cylinder 84 is submerged in cham- =ber 80. Cylinder 84 has an inlet passage 86, and receives an upright plunger 88 having a slender valve rod 90 passing therethrough. The pump is operated by an actuator 92, and this is connected by a'yoke 94 to the upper end of the plunger 88. A compression spring 96 is disposed between the actuator 92 and the upper end of the Valve rod 90.

The lower end of the pump cylinder 84 has a ball 100 urged upward by a compression spring 102 and acting as a check valve for the pump. The lower end of valve rod 90 projects well below the lower end of plunger 88, and bears against and opens the valve 100. The amount of cement ejected may be varied by varying the downward projection of valve rod 90 below the plunger 88. For this purpose a screw adjustment is provided, there being a threaded knurled nut 98 whic-h may be rotated to change the position of the lower end of the valve rod 90 relative to the plunger 88. The upper end of rod 90 is threaded to receive the nut 98, and spring 96 bears against nut 98.

The plunger 88 is moved positively by means of yoke 94, but the valve rod 90 is moved yieldably by compression spring 96. Thus, when the valve rod has moved the ball 100 all the way down against the upper end of slotted tube 118, therod readily yields. The valve rod has some further advantage in holding the valve open momentarily as the pump plunger rises, thereby providing -a bit of suction or withdrawal of the heated cement at the cups of the applicator when the support is lowered. This guards against drip of adhesive material in the machine. The actuator 92 is hydraulically operated under control of a four-way valve 104, this being solendoid-operated by a solenoid 106. The chamber 80 may be replenished with cement by raising a cover 108 by means of a handle 110. The chamber 80 may be drained, should that become necessary, by means of a drain plug 112.

The heated hose, and a terminal block closely associated with the same, may be described with reference to FIGS. 2, 4 and 5. The hose 120 is preferably made of Teflon, and it is reinforced by a metal wire braid 122 on its exterior. Such lhose is commercially available, a typical example being the Vitaiiex hose made by Atlantic Metal Hose Co., Inc. of New York city, New York. The Teflon hose has a smooth non-adhesive inside wall, and is well suited to convey sticky liquids.

In the aforesaid Patent 3,228,047 the hose was heated by the application of electrical current to the wire braid. However this requires heavy current, and is inefficient because of the heat insulating property of the Teflon hose itself. In the present case the hose is heated by means of a resistance wire which is directly inside the hose. More specifically there is a tiexible resistance heater wire indicated at 124 (FIGS. 2 and 4) which extends from a terminal block 126 (FIG. 2) through the entire length of the hose 120, and then reverses direction at 128 and extends back again through the hose to the block 126, as indicated at 130. The resistance Wire is insulated by a series of ceramic beads 132 which are strung on the wire along substantially its entire length from end to end.

The threaded terminals or ttings 119 and 121 at the ends of the hose 120 may be standard, and are permanently secured or clamped to the hose in any fashion preferred by the hose manufacturer, because the hose usually is bought with the end fittings attached. It is not subjected to high pressure. For the convenient provision of insulatedly mounted electrical terminals for the inside heater Wire I provide a hollow metal block 126, which is conveniently made of two halves drawn tightly together by means of four socket head screws indicated at 134 in FIG. 2. FIG. shows how the block is made of parts 126 and 126 meeting on face 136. The ends of the block are threaded to receive standard pipe connections.

Because of the high temperature obtainable inside the hose with the present arrangement, the hose may be of relatively small diameter. In the present case it has an inside diameter of 5/16 inch and an outside diameter of 1/2 inch, and it is therefore less expensive and more flexible than the externally heated hose heretofore used. It is also more economical in the use of electrical current.

One half of the block 126 has two insulated electrical terminals passing therethrough, as indicated at 138 and 140 in FIG. 2 and FIG. 5. The external electrical power supply connections are shown at 142 (FIG. 2). The internal connections are made inside the block, and it will be understood that it is easy to replace the resistance Wire if it burns out, it being necessary merely to. separate the halves of the block by releasing the screws 134 for this purpose.

Because the hose is heated to a fairly high temperature it preferably is sheathed in a loose asbestos tube, indicated at 144. This tube may be loose enough to slide over the fittings at the ends of the pipe, and its primary purpose is merely to guard against possible discomfort to the hands of an operator using the lasting machine, should he touch the upper end of the hose.

The other end of the block 126 is connected to the lower end of the pump, and for compactness itis preferably connected by means of a conduit in the form of a pipe elbow 146 shown in FIG. 2. The cement used is so fast acting that even a short part of the system such as the pipe elbow 146 is desirably heated, and for this purpose a resistance wire 148 is wrapped around the elbow, and is itself enclosed in a suitable covering such as a winding of fibre-glass tape indicated at 150.

The electrical circuitry is schematically shown in FIG. 3. The tank heater 82 is heated through a temperature control device 152. The elbow heater 148 is preferably heated through its own temperature control device 154. The cement applicator 34 and its heater 72 is supplied through another temperature control device 156. The hose 120 and its heater 124 are heated through still another temperature control device 158, and in the particular case here shown, the supply for the latter is a volt supply, whereas the other heaters are energized from a 220 volt supply. The use of separate controls is desired so that optimum temperature may be obtained in each part of the system, independently of the other parts of the system. The control element 152 for the tank heater may be controlled automatically, as by means of a temperature responsive probe inserted in the tank and connected back to the control element 152, with suitable circuitry for automatic operation.

Reverting to FIG. 1, the cement chamber and pump are housed at 160. The heater controls are located on the panel of a control box, not shown, which may be located immediately adjacent the housing 160. The elbow for the hose is shown at 150, but the adjacent terminal block and hose as well as the power supply conductors are omitted in order not to conceal other parts of the machine.

The controls at 17 which are operated in sequence by a step-by-step element need not be described in detail because they form a part of the machine described in Patent 3,066,329, and may be modified by the addition of a switch to actuate the cement pump solenoid (106 in FIG. 2) as is described in the aforesaid Patent 3,228,047.

The main foot treadel 15 is initially pressed part Way down, which causes the pincers to grip the lower edge of the upper while the operator may still adjust the position of the shoe, whereupon the treadle is pressed all the way down, which causes the pincers to pull the upper and to move the heel pad 30 inward, The cement pump applies cement which remains heated as the treadle is released. The treadle is then pushed down a second time to cause the head 18 of the machine to move inward; the toe pad 24 to come down; the pump to retract; and the applicator 34 to move down, whereupon the wipers move in and the pincers are released. The button support 14 then moves down when cylinder 40 breaks the toggle 38, 39 to permit the wipers to move all the way in by action of the wiper cylinder 32.

After a brief delay the shoe may be released by touching a theadle-release 162. This release may be automatically timed by means of a timer instead of being performed by foot. The cement acts so fast that there 1s no need for the operator to work with two lasting machines, as was done when using slow acting cements.

It is believed that the construction and operation of my improved heated cement supply system for a toe lasting machine, as well as the advantages thereof, will be apparent from the foregoing detailed description. It will also be understood that while I have shown and described the invention in a preferred form, changes may be made without departing from the scope of the invention as sought to be defined in the following claims.

I claim:

1. A heated cement supply system comprising: a ilexble hose made of Teflon for conveying the cement from a supply tank to a delivery point in a shoe machine, threaded end fittings secured to the ends of the hose, a hollow metal block receiving one of said end fittings at one end of the block, the other end of said block having an opening, a exible resistance heater wire extending from the block lengthwise through the hose and back again to the block, insulating ceramic beads along the entire length of said wire, two insulated electrical terminals on said block passing into the same, the ends of said resistance heater wire being connected to said terminals inside the block, a conduit connected at one end into said opening and adapted at the other end for connection into a heated cement supply tank, an additional heater secured to said conduit to heat the cement during its passage from the supply tank to the block, and means for control of cement temperature in said system.

2. A cement supply system as defined in claim 1 in which the block is made of two halves secured together in face-to-face relation, by means of screws which are releasable Vso that the block may be opened to facilitate replacement of the resistance heater Wire.

3. A cement supply system as dened in claim 1 in which there is a metal braid on said Teon hose, and a loose heat insulating jacket outside the metal braid of the hose.

4. A cement supply system as defined in claim 1 in which there is a tank for the cement, a submerged cement pump in the tank, electrical heating means for the tank, and two separate temperature controls, one for the tank and one for the hose.

5. A cement supply system as dened in claim 4 in which the heated Conduit is a pipe elbow between the pump and the metal block, and in which an additional electrical resistance heater wire is wound around the elbow to heat the cement during its passage from the pump to the block.

6. A cement supply system as dened in claim 1 in which there are three separate temperature control means, one for the tank, one for the hose, and one for the conduit.

7. A cement supply system as defined in claim 5 in which the remote end of the heated hose is connected to a cement applicator, and in which the cement applicator is itself provided with an electrical resistance heater t0 heat the cement after it leaves the heated hose.

8. A cement supply system as dened in claim 7 in which there are fout separate temperature control means, one for the tank, one for the elbow, one for the hose, and one for the cement applicator.

9. A cement supply system as dened in claim 1 in which there are two separate temperature control means, one for the hose and one for the conduit.

References Cited UNITED STATES PATENTS 2,583,761 1/1952 AXelSon 219-307 2,599,671 6/1952 Thompson 219-307 3,097,380 7/1963 Quinn 219-421 X 3,221,937 12/1965 Kamborian 219-328 X 3,286,078 11/1966 Hynes 219-306 BERNARD A. GILHEANY, Primary Examiner, H. B. GILSON, Assistant Examiner, 

1. A HEATED CEMENT SUPPLY SYSTEM COMPRISING: A FLEXIBLE HOSE MADE OF TEFLON FOR CONVEYING THE CEMENT FROM A SUPPLY TANK TO A DELIVERY POINT IN A SHOE MACHINE, THREADED END FITTINGS SECURED TO THE ENDS OF THE HOSE, A HOLLOW METAL BLOCK RECEIVING ONE OF SAID END FITTINGS AT ONE END OF THE BLOCK, THE OTHER END OF SAID BLOCK HAVING AN OPENING, A FLEXIBLE RESISTANCE HEATER WIRE EXTENDING FROM THE BLOCK LENGTHWISE THROUGH THE HOSE AND BACK AGAIN TO THE BLOCK, INSULATING CERAMIC BEADS ALONG THE ENTIRE LENGTH OF SAID WIRE, TWO INSULATED ELECTRICAL TERMINALS ON 